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Old 04-21-2015, 04:30 AM   #1
Iberico OP
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Location: Backroads of the iberian Peninsula
Oddometer: 15
My R100Gs PD doesn't like water!

Hi guys, I wanted to ask before I start digging around without a real clue...
Whenever I ride my Gs through a stream or a small river it seems to go on "one cilynder mode" for a while...eventually after some farting and burping it seems to come back to life
What is your guess? Damp getting to o one coil ? Spark plug cables?
Spark plug caps? Anything elese?
It only just started doing it...and it is a shame because I love to ride my gs where my friends with much lighter thumpers dont dare
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Old 04-21-2015, 07:02 AM   #2
spo123
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So then, make some waterproofing tweaks.
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Old 04-21-2015, 07:12 AM   #3
patrkbukly
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Lifegaurd

Just to quantify...what is a "small stream"


Like how deep we talking?
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Old 04-21-2015, 07:18 AM   #4
Rob Farmer
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You could try not riding through streams and small rivers!

Do your spark plug caps have rubber seals on them like the ngk ones?
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Old 04-21-2015, 07:24 AM   #5
bgoodsoil
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There was a run of grey coils that would get fine cracks in the housing. When warm, the cracks would open enough to let moisture in.

I had a similar problem on a road trip. I'd die in the rain. Turns out I was getting water funneled straight to the coil through the gap at the side of the HPN tank.

I bought some ignition coating and hosed down pretty much everything. That fixed it well-enough to get me to Newfoundland and back. Maybe not permanent--but that's permanent enough for me!
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Old 04-21-2015, 07:45 AM   #6
hardwaregrrl
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I'd vote for plug caps....but Bgood did have very similar problems in NFLD. And he was just riding in Canadian rain
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Old 04-21-2015, 07:50 AM   #7
anderstornvig
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Airheads and water crossings
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Old 04-21-2015, 09:33 AM   #8
Beater
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Water in the carb bowl?
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Old 04-21-2015, 09:49 AM   #9
Iberico OP
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Wow
Thanks for such quick responses

Regarding The depth of the streams...well...we are talking maybe cilinder depth maximum...not air filter! At least that is what I believ when I go in!
I' m reading the suggested post airheads and water now
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Old 04-21-2015, 09:54 AM   #10
SCQTT
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Before I retired mine it had the aforementioned coil problem.
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Old 04-21-2015, 11:16 AM   #11
FrankR80GS
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Quote:
Originally Posted by SCQTT View Post
Before I retired mine it had the aforementioned coil problem.
Almost any BMW with a grey "double spark" Bosch Coil suffered from that problem. It's really a shame, that BMW used this known mediocre coil for such long time.

If the problem occurs only when riding through rivers or creeks it's more likely the spark plug connectors, in particular if you still have the stock ones with the metal cap.
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Old 04-21-2015, 02:51 PM   #12
AK Bob
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Or

Seal up the Air box, convert some U-Boat Technology, and run a Snorkel...
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Old 04-21-2015, 03:22 PM   #13
rheritage
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This does not sound like an electrical problem with the depths you're talking about, start with carbs first, make sure you have no leaks in intake tubing as well.

Good Luck!!!

Rich
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rheritage screwed with this post 04-22-2015 at 03:41 AM
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Old 04-21-2015, 04:19 PM   #14
Warin
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Post event;
Check float bowels for water. If there is none there then I'd be replacing the spark plug caps and HT leads.

During ... if you have problems on one crossing and are faced with others .. pull the float bowels and check for water. Where there is water .. empty it out (I've put the fuel back into the tank when fuel range is required, just reject the lats bit with the water). Pull the oil dip stick and use the few drops of oil to coat the HT leads and spark plug caps as a water resistant layer.
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